20-Hour Fast Starting at 1:00 PM: End Time Calculator
This calculator-style page answers the timing question first, then shows how to track the same window in Fast Goblin.
Calculation
1:00 PM + 20 hours = 9:00 AM (next day)
Example fasting day
For a simple example, start your timer at 1:00 PM, keep the fast going through the full 20 hours, and break it at 9:00 AM. If that window feels awkward, move the start time instead of changing the whole plan.
Common mistakes
Track it in Fast Goblin
Fast Goblin can save the calculation by letting you start the fast and see the end time automatically. No more checking the clock twice and still being unsure.
How Fast Goblin helps
Fast Goblin can save the calculation by letting you start the fast and see the end time automatically. No more checking the clock twice and still being unsure.
Common questions
What time does a 20-hour fast end if it starts at 1:00 PM?
It ends at 9:00 AM the next day.
Does the date matter?
For overnight or multi-day fasts, yes. The page shows whether the end time falls on the same day or a later day.
Can I use a different start time?
Yes. Use the calculator index or set a custom timer in Fast Goblin.
Fast Goblin is a tracking app, not medical advice. Intermittent fasting is not for everyone; people who are under 18, pregnant or breastfeeding, have a history of eating disorders, or use insulin/diabetes medication should talk to a qualified professional before changing fasting routines.
